常减压蒸馏装置塔顶低温部位腐蚀是一个在全球炼油厂普遍存在的问题。解决盐酸引起的塔顶腐蚀问题,首先要控制原油中的氯化物含量,其次要在塔顶系统中注入有机中和剂和缓蚀剂。以浙江石油化工有限公司装置为例,重点介绍了原油注碱的工艺实施及后期效果。结果表明,通过该工艺可以有效降低常压塔顶氯离子含量,减缓塔顶冷凝系统的腐蚀。

The corrosion occurred at the low temperature part on the top of atmospheric and vacuum distillation towers is a common issue in refineries all over the world.To reduce the tower top corrosion caused by hydrochloric acid,the content of chlorides in crude oil needs to be controlled at first,and then organic neutralizer and corrosion inhibitor are needed to inject into the tower top system.Taking the 2^# CDU of Zhejiang Petrochemical Co.,Ltd.as an example,the "one removal and three injection" process is adopted to prevent corrosion,and the implementation of crude oil alkali injection process and its later effects are introduced.It is found that this process can effectively reduce the content of chloride ion at the top of the atmospheric tower and slow down the corrosion to the condensation system at the top of the tower.